Incoming Resources
- Big machines, by Angela Royston ; illustrated by Terry Pastor
- Airplanes and trucks and trains, fire engines, boats and ships, and building and wrecking machines, by George Zaffo
- Basic machines and how they work
- The how and why of mechanical movements, exactly how machines work: engines, turbines, transmissions, brakes, clutches, rockets, atomic generators, gyroscopes, guidance systems, Illustrated by Ray Pioch